[NTP Snippets] Always show the bookmarks section, but at the end if it's empty

components/ntp_snippets/content_suggestions_service.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 #define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 168 matching lines @@
 
   // Removes a suggestion from the local stores |id_category_map_| and
   // |suggestions_by_category_|, if it exists. Returns true if a suggestion was
   // removed.
   bool RemoveSuggestionByID(Category category,
                             const std::string& suggestion_id);
 
   // Fires the OnCategoryStatusChanged event for the given |category|.
   void NotifyCategoryStatusChanged(Category category);
 
+  void SortCategories();
+
   // Whether the content suggestions feature is enabled.
   State state_;
 
   // Provides new and existing categories and an order for them.
   CategoryFactory category_factory_;
 
   // All registered providers, owned by the service.
   std::vector<std::unique_ptr<ContentSuggestionsProvider>> providers_;
 
   // All registered categories and their providers. A provider may be contained
@@ skipping 28 matching lines @@
   // background fetching and debugging calls to it. If the NTPSnippetsService is
   // loaded, it is also present in |providers_|, otherwise this is a nullptr.
   NTPSnippetsService* ntp_snippets_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSuggestionsService);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_SERVICE_H_